When I first started thyroxine, I had a week of hyperthyroid symptoms followed by a month of worsening hypothyroid symptoms. At first I had too much thyroid hormone then my thyroid gland
decided to lower its thyroid hormone production in response to medication. Sounds like to me you are in the same boat - worsening of hypothyroid symptoms. and
200mcg is far too high to start with.
Drugs website - levothyroxine
Usual Adult Dose for Hypothyroidism
The initial dose is 12.